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Hello,
92 lt1 46,000 miles. Last year I put nkg tr 55 plugs in , gapped at .50. Did I do the right thing , or should I have gone with a/c delcos ?
If it's running good...then you did the right thing. If it's running like crap, then go stand in the corner until someone from your local Corvette club comes by to admonish you properly
Seriously though, I stuck a new set of plugs in mine last year when I swapped out the Optispark and water pump, The plugs I pulled out looked to be the originals. I went back with AC/Delco. I do use NGK in some of my other toys. The only plug I refuse to buy are Champions.
